Fan-Fiction as Mods in Games

Today I want to talk about a subject for which I’ve honestly seen little discussion in the game development community. That’s not to say such debate doesn’t exist; if it’s out there, I have largely failed to find it. The issue is this:

What are the effects of fan-fiction on games? Particularly those games which allow user-created mods?

Anyone who’s played role-playing games in the last decade probably knows what franchise I’m about to discuss. But before that I want to explain the impetus behind this post.